UCF-HMDB is constructed by collecting the relevant and overlapping
action classes from UCF\(_{101}\)  [1]} and HMDB\(_{51}\)  [2]}.
It contains 3,209 videos in total with 1,438 training videos and 571 validation videos from UCF\(_{101}\) , and 840 training videos and 360 validation videos from HMDB\(_{51}\) .
This in turn gives two video-based UDA tasks: \(\mathbf {U}\rightarrow \mathbf {H}\)  and \(\mathbf {H}\rightarrow \mathbf {U}\) .
